我有一个DataFrame:
import pandas as pd
import numpy as np
df = pd.DataFrame({'foo.aa': [1, 2.1, np.nan, 4.7, 5.6, 6.8],
'foo.fighters': [0, 1, np.nan, 0, 0, 0],
'foo.bars': [0, 0, 0, 0, 0, 1],
'bar.baz': [5, 5, 6, 5, 5.6, 6.8],
'foo.fox': [2, 4, 1, 0, 0, 5],
'nas.foo': ['NA', 0, 1, 0, 0, 0],
'foo.manchu': ['NA', 0, 0, 0, 0, 0],})
我想在以开头的列中选择1的值foo.
。除了以下以外,还有更好的方法吗:
df2 = df[(df['foo.aa'] == 1)|
(df['foo.fighters'] == 1)|
(df['foo.bars'] == 1)|
(df['foo.fox'] == 1)|
(df['foo.manchu'] == 1)
]
类似于写类似的东西:
df2= df[df.STARTS_WITH_FOO == 1]
答案应打印出如下所示的DataFrame:
bar.baz foo.aa foo.bars foo.fighters foo.fox foo.manchu nas.foo
0 5.0 1.0 0 0 2 NA NA
1 5.0 2.1 0 1 4 0 0
2 6.0 NaN 0 NaN 1 0 1
5 6.8 6.8 1 0 5 0 0
[4 rows x 7 columns]